Drill.



G. PAULI.

DRILL.

APPLIOATION FILED 11011.28. 191s.

1,106,966. Pa1en1edAug.11,1911

UNITED STATES PATENT OFFICE.

CARL PAULI, OF ROSELLE PARK, NEW JERSEY, ASSIGNOR TO N. HARPER STEWARD,OF PHILADELPHIA, PENNSYLVANIA.

DRILL.

Specification of Application filed November 28, 1913. Serial No.803,393.

To all whom.- t't may concern.' l

Be it known that I, CaniJ PAULI, a'citizen of the United States,residing at Roselle Park, in the county of-Union, State of New Jersey,have invented a new and useful Drill, of which the following 1s aspecification. r

My invention consists of improvements in drills, more particularly forstone, brick, cement and the like, the same embodying crossed bits whosecutting edges are adapted to be cont-inuous in their respectivedirections, thus avoiding a gap at the central point of the drill.

llt consists also of novel means for securing the bits to the drillhead, the same being simple, inexpensive and practical in their nature,as will be hereinafter referred to.

The invention is satisfactorily'illustrated in the accompanying drawing,but the important instrumentalities thereof may be varied, and so it isto be understood that the invention is not limited to the specificdetails shown and described.

Figure l represents a side elevation of a drill embodying my invention.Fig. 2 represents a bottom plan view thereof. Fig. 3 represents alongitudinal section thereof. Fig. 4 represents a similar section, thebits having beeii'removed. Fig.. 5 represents a transverse section 'online .fr-m Fig. l. Fig. 6 represents a perspective view of the bitsremoved from the head of the device. Fig. 7 represents an edge view ofone of the/bits. Fig. 8 represents a perspective view of the bits inseparated condition.

Similar numerals of reference indicate corresponding parts in thefigures.

Referring to the drawings -1 designates a head the same having on an endthereof, the longitudinally extending recesses or grooves 2, 2, whichextend therein in dia.- metrically opposite directions so as to crosseach other. y

3, 3, designate boring or drill bits whose shanks 4 are adapted to befitted in said grooves 2, each being provided with a throatv 5, oneextending into-the body of the bit from the cutting edge, and the otherthroat extending into the body in the shank there- 0f .seth t the.throat .0f @bit twente the. zhroatofl th'ebtherl bit, the its-thus'roszsiii'fzlifi each other and presenting a plurality of cut'-ting edges 6, which likewise cross each other, and so extend indiametrically opposite directions to the work of boring ordrilli'iig tobe accomplished. On t-lie center portion of the sides of the cuttingedge of one ofI the bits are outwardly or laterally projecting fillets7, each of which extend from the side of the shank of the bit in V-shapetoward said cutting edge, and has a cutting edge 8, the cutting edges 8of the two sides of the bit converging to the center of the cutting edgeof the it, it being noticed that said cutting edges 8 are at a rightangle or transverse'to the cutting edge 6, and consequently in a rightline with the cutting edge 6 of the other bit, and continuities of thelatter named edge, whereby the two crossed cutting edges of the two bitsbegin at the central point 9 of the bits and continue unbroken therefromto the outer side terminals of the cutting edges, and thus there is nogap at the center of the cutting edges of the bits, whereby the drillingor boring may be accomplished by the entire lengths of said cuttingedges positively from the center of the same tothe side terminalsthereof.`

The side of the end portion of the head l where the shank of the bitsare fitted therein is grooved forming comparatively the screw-threads10, and the side edges of the Shanks 4 of the bits are similarly groovedforming comparatively the screw-threads 11, which when said bitsfare inposition in the head harmonize with the screw threads 10 of the head,t-lius producing screw-threads in thel bits and head, continuities ofeach other, as shown in Fig. 1. In said screw threads is fitted therotatable collar 12, which is formed preferably of -a band of suitablemetal or piece of wire shaped into a helical coil so as to occupy saidthreads and capable of being rotated after-'the manner of a screwnut',"its convolutions entering the threads of the head and Shanks ofthe bit, thus connectin the bits with the head and retaining the ormerfirmly in the latter, said coil collar occupyingthe threads of theShanks of the bit` and head, comparatively lush with said head andShanks. In order to prevent improper rotation of the collar, a terminalt ereof is deflected inwardly formig the offset 13 which is adapted as sou to nter he ort'o of. th traag/,itil artis anvautiaftiafhlt stie threawith which it is contiguous and be seated frictionally thereagainstproviding a lock for the collar thus preventing unscrewing of the collarand consequent disconnection of the bits from the head, as most apparenton reference to Fig. 5. It is evident that when the offset or shoulder13 is drawn out of the depression that it occupies, the collar may berotated or unscrewed when it leaves the shanks of the bits, and thus thelatter are no longer controlled in the head, and so may be removedtherefrom, and separated from each other, a feature of importance forsharpening, repairs, etc., after which bits may be re-assembled andlocated in the head and secured by the collar when the drill is readyagain for operation.

The collar 12 is preferably formedzof a coil of resilient-metal, such assteel wire, as a skeleton nut, the end thereof having the offset thereonbeing particularly resilient so that said offset may spring into thedepression that it occupies and retain its seat therein, so as toprevent improper motion of the collar. It will be noticed also that thecutting edges of the crossvbits are tapering in their nature so that thecenter of the coinbined cutting edge is in advance of the remainder ofsaid edges, and that owing to the fillets, the cross cutting edges haveco1n paratively a common center which begins the work of boring ordrilling, and as the several cutting edges extend unbroken from saidcenter to their outward terminals, said Work may be continued in amanner effective in its results.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent, is

l. In a drill, a head having on the end ther^of longitudinally-extendingrecesses in diametrically opposite directions, a plurality of bitsadapted to be fitted together crossing each other and having theirShanks adapted to occupy said recesses, the sides of said Shanks andvcorresponding portion of the side of said head having registering screwthreads thereon, a collar of the form of a screw coil adapted to engagesimultaneously said threads of the shanks and head.

2. In a drill, a head having on the end thereof longitudinally-extendingrecesses in diametrieally opposite directions, a plurality of bitsadapted to be fitted together crossing each other and having theirshanksadapted to occupy said recesses, the sides of said shanks andcorresponding portion of the side of said. head having registering screwthreads thereon, a collar of the form of a screw coil adapted to engagesimultaneously said threads of the Shanks and head, said collar havingan inturned shoulder which is adapted to be seated frictionally in theportion of the convolution of the screw thread with which it iscontiguous.

3. In a drill, a head, a bit, and a collar, said bit having its shankadapted to occupy said head, the sides of said bit and head havingcorresponding screw threads thereon, said collar being of the form of ascrew coil which is adapted to occupy simultaneously the threads of saidhead and Shanks.

4. In a drill, bits adapted to be fitted to each other cross-wise, oneof said bits having thereon about the center of its cutting edge outwardprojecting fillets, said fillets having cutting edges adapted to formcontinuities of the cutting edge of the other bit.

5. In a drill, bits formed with slots adapting said bits to be fitted toeach other crosswise, fillets on the sides of one of said bits about thecenter of the cutting edge thereof, said fillets having cutting edgesadapted to forni eontinuities of the cutting edge of the other bit.

G. In a drill, bits formed with slots adaptino' said bits to be fittedto each other crosswise, fillets on the sides of one of said bits aboutthe center of the cutting edge thereof, said fillets having cuttingedges which extend transversely to the cutting edge of the other bit andadapted to form continuities thereof.

7. In a drill, bits formed with throats one of which is adapted to beoccupied by the other, connecting said bits cross-wise, one of said bitshaving thereon about the center of the cutting edge thereof filletswhich project outwardly from said cutting edge and have their cuttingedges adapted to form continuities of the cutting edge of the other bit,the walls of the throat of the other` bit being adapted to contact withthe sides of said fillets.

8. In a drill, bits formed with throats one of which is adapted to beoccupied by the` other, connecting said bits cross-wise, one of saidbits having thereon about the center of the cutting edge thereof filletswhich project outwardly from said-cutting edge, the walls of the throatof the other bit being adapted to contact with the sides of saidfillets, said fillets having cutting edges which are adapted to extendcontinuously from the cutting edges of the other bit at the throatthereof to the center of the cutting edge of the bit which carries saidfillets.

CARL PAULI. lVitnesses:

DAVID TULLoCH, Jr., CLARICE HUNTE.

